Solutions by everydaycalculation.com
642 - 2142 is -514.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/42-21/42 6/84-21/42 6/42-21/84 18/42-21/42 6/42-63/42 30/42-21/42
© everydaycalculation.com